<!DOCTYPE html>
<!-- jsdom only test without offsetWidth -->
<html  lang="en" >
<head>
<meta charset="utf-8"/>
<title>[lang|="es-MX"], lang="es"</title>
<link rel='author' title='Richard Ishida' href='mailto:ishida@w3.org'>
<link rel='help' href='http://www.w3.org/TR/css3-selectors/#attribute-selectors'>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style type='text/css'>
.test div { width: 50px; }
#colonlangcontroltest { color: red; font-weight: bold; width: 400px; }
#colonlangcontroltest[lang|=xx] { display:none; }
#box[lang|='es-MX'] { width: 100px; }
#relevance[lang|='yy'] { display:none; }
</style>
</head>
<body>

<div class="test"><div id="box" lang="es">&#xA0;</div></div>
<p lang='xx' id='colonlangcontroltest'>This test failed because it relies on [lang|=..] for results, but [lang|=..] is not supported by this browser.

<!--Notes:
This tests a detail related to [lang|=..] support. If [lang|=..] is not supported, a message will appear and the test will fail.
-->
<script>
"use strict";
test(() => {
  assert_equals(window.getComputedStyle(document.getElementById("colonlangcontroltest")).display, "none");
  assert_false(document.getElementById("box").matches("#box[lang|='es-MX']"));
}, "A lang|= value will NOT match a lang attribute value when the former contains more subtags.");
</script>

<div id='log'></div>

</body>
</html>
